Cushion valve and seat.



R. C. 'WITMER.

CUSHION VALVE AND SEAT.

APPLICATION FILED DEC- 1. 1914.

1,218,030. Patented Mar. 6, 1917.

2 SHEETS-SHEET I.

1% 94126329 Suva flow R. C. WITMER.

CUSHION VALVE AND SEAT.

APPLICATION FILED 0507,1914.

1,218,030. Patented Mar. 6, 1917.

2 SHEETS-SHEET 2.

uvcufo'c ROY C. WITMER, 0F FITCHBUBG, MASSACHUSETTS.

CUSHION VALVE AND SEAT.

Specification of Letters Patent.

Patented Mar. 6, 1917.

Application filed December 7, 1914. Serial No. 875,875.

To all whom it may concern:

lie it known that 1, Key C. \VrrMnn, a citizen of the United States, residing at Fitchburg, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Cushion Valves and Seats, of which the following is a specification.

The present invention relates to valves and is designed primarily for use in connection with condenser pumps, where both air and water are pumped, but the scope of the invention is not to be construed as limited to such use, for the improved valve can be employed in connection with other pumps with advantageous results.

The primary object of the invention is to provide a self seating valve which is cushioned by the fluid being pumped, and thereby is rendered noiseless and has its wearing qualities indefinitely lengthened.

Another object of the invention is to so construct the valve that the cushioning means will also act as a seal to prevent passage of air.

\Vith these and minor objects in View the invention will be fully explained and its principles of construction and operation exemplified in connection with the several embodiments illustrated in the accompanying drawings forming a part of this specification.

In said drawings:

Figures 1, 2 and 3 show one embodiment of the invention, Fig. 1 being an axial section showing the valve seated; Fig. 2, a vertical section showing the valve raised; and Fig. 3 a plan view of the valve seat.

Figs. 4. 5 and 6 are axial sectional views of modified constructions; Fig. 4. showing the cushioning device with adjacent seating faces applied at the hub as well as at the rim of the valve and seat; Fig. 5 showing the cushioning device omitted from the rim; and Fig. 6 showing the seating faces restricted to the rim and the cushioning device without the seating faces located at the hub.

Referring to the drawings in detail, 1 represents the valve seat, which in Figs. 1 to 4 has formed in its seating face 7, near its periphery, an annular sealing and cushion ing channel 2. 3 represents the valve having formed thereon in Figs. 1 to 4, a bead or extension 4 adapted to enter the sealing and cushioning channel 2 on the valve seat 1, when the valve is seating. In all the forms the valve 3 is furtherprovided with a spring 5 for automatically and positively returning it to its seat 1 after it has been opened, and a valve stem (3 projecting from the seat, and by which the valve is guided. The seating face 7, being divided by the cushioning groove 2, as is shown in forms shown in Figs. 1 to 4, provides double seating faces for the valve 011 opposite sides of the cushioning and sealing means. In Figs. T to 6 the valve is cushioned at the hub, which may be desirable where heavy pressures are resisted, in order to avoid dishing the valve. According to Fig. 4;, this-hubcushion may be in addition to the rim-cushion, whereas in Figs. 5 and 6 it may be at the hub alone. Again, the valve may have the sustaining face 7 at the center in addition to the seating and sustaining face 7 as shown in Figs. 4 and 5. But where the conditions are such that the pressure is needed mainly at the rim, for sealing the valve, a recess 9 may be provided around the hubcushion 2 P, as shown in Fig. 6.

The extensions 4 or 4 and their channel 2 or 2 are sufiiciently close in radial dimension to prevent the too free escape of fluid from the sealing and cushioning channel, as the extension enters, and thereby insure the cushioning effect. And to get the best re sults, the sides of these intermeshing parts are not only substantially parallel, but perpendicular to the seating plane so that the extension entraps a considerable body of fluid as it enters the channel. A further advantage attained from this construction where used for sealing as well, is that the' films of fluid left between the parallel walls of the intermeshing parts are comparatively thin and therefore more resisting to the leakage of air or gas that the valve may be required to hold. It is to be noted that the water seal lies between the two annular seating faces of the valve, and this further assists in making the valve tight.

From the foregoing description, it will be i seen that the fluid in the channel 2 or 2 will provide a very effective cushioning effect by displacement of the fluid as distinguished from compression of a lighter medium, render the valve noiseless, and lengthen the wearing qualities of the valve, and that in thechannel 2, it also provides a water seal and thereby prevents the pas sage of air past the seated valve. In a fast working pinup, the face of the valve could never come to complete rest on the seat, inasmuch as the fluid cushion would retard its motion to such an extent that it would be opened before it had finished its seating action; this being the case, there would be no wear on the intermeshing and abutting parts.

I claim 1. A check valve of the pulsating type comprising two members, to Wit, a valve and its seat, one of said members being constructed with a substantially parallel-sided groove, in position to receive and retain fluid passing the valve, and the other of said members being constructed with an entering portion adapted to enter and trap fluid in saidgroove as the valve closes.

2. A check valve of the pulsating type comprising two members, to wit, a valve and its seat, one of said members being con structed With a substantially parallel-sided groove, in position to receive and retain fluid passing the valve, and the other of said members being constructed with an entering portion adapted to enter and trap fluid in said groove as the valve closes, said entering portion being also provided with parallel sides and being approximately of the same transverse dimensions as the groove.

3. A check valve of the pulsating type comprising two members, to Wit, a valve and its seat, one of said members being constructed with a substantially parallel-sided groove, in position to receive and retain fluid passing the valve, and the other of said members being constructed with an entering portion adapted to enter and trap fluid in said groove as the valve closes, said valve and seat being also constructed with seating faces on opposite sides of said cushioning means.

4. A check valve of the comprising two members, seat having a hub and adapted thereto; said members being constructed with a two-part cushioning means comprising a groove and a flange entering said groove; one part of the cushioning means being located on the rim of the valvepulsating type to wit, a valvea rim, and a valve seat, and the other part in a corresponding position upon the valve; said flange and groove being constructed to trap fluid between them as the valve closes.

5. A check valve of the pulsating type comprising two members, to Wit, a valveseat having a hub and a rim, and a valve adapted thereto; said members being constructed witha two-part cushioning means comprising a groove and a flange entering said groove; one part of the cushioning means being located on the rim of the valveseat, and the other part in a corresponding position upon the valve; said valve and seat members being also provided with a twopart cushioning means located, the one part on the hub of the seat and the other part in a corresponding position on the valve.

6. A check valve of the pulsating type comprising two members, to wit, a valveseat having a hub and a rim, and a valve adapted thereto; said members-being constructed with a two-part cushioning means comprising a groove and a flange entering said groove; one part of the cushioning means being located on the hub of the valveseat, and the other part in a corresponding position upon the valve.

7. A check valve of the pulsating type comprising two members, to wit, a valveseat having a hub and a rim, and a valve adapted thereto; said members being constructed with a two-part cushioning means comprising a groove and a flange entering said groove; one ,part of the cushioning means being located on the rim of the valveseat, and the other part in a corresponding position upon the valve; said valve and seat members being also provided with a twopart cushioning means located, the one part on the hub of the seat and the other part in a corresponding position on the valve; said valve and seat having seating faces adjacent to both the said cushioning means.

The foregoing specification signed at Fitchburg, Mass, this sixteenth day of N ovember, 1914c.

ROY C. WITMER. In presence of- EMERSON W. BAKER,

FREDERIGH H. MILLWARD. 

